St. Sophia church (also known as the Old Metropolia) 5th - 6th c., Nessebar

This is one of the most imposing ancient buildings. The central nave is two times larger than the lateral ones and is separated by massive pillars linked with arches. The church was constructed of stones and bricks, situated in layers of 5 rows, soldered with a mortar, mixed with big parts of bricks. The floor was covered with mosaic.